Extruded depolarizing bobbin



. A. J. BR'IGGs yEX'IRUDED DEPOLARIZING BOBBIN Filed March 31. 19221 QN A v//////////V/////w mmmwmmmmwwm Patented May 29, 1928.

UNITED STATES y z `1,671,401 PATENT OFFICE.

ARTHUR J. BRIGGS, OF SYRACUSE, NEW YORK, ASSIGNOB TO NATIONAL `GARBON COMPANY, INC., A CORPORATION OFYNEW YORK.

' EXTRUDED IBI-IPOLAIBIIZINGl BOBBIN.

This invention relates to depolarizing bobbins for electric cells Iand to processes and apparatus for preparing the same. The object of the invention is to improve the quality of such articles and to provide new forms thereof, as well as to decrease the costs and time of manufacture.

The invention includes bobbins having a new type of supporting covering, and improved forms of bobbin especially suitable for deferred action cells of the water-activated type, and it contemplates the application of extrusion apparatus and processes to the production of such bobbins, all as hereinafter more particularly described, and as claimed. i

It has heretofore been proposed to prepare tubular mix bobbins by extrusion, to force a cylindrical carbon electrode into the perforation through each bobbin while the composition retains its plasticit and to wrap the bobbins in a suitable fabric subsequent to the insertion of the electrode. According to the present invention, the wrapping is effected by mechanical means as the composition is extruded The carbon electrodes are then inserted in the wrapped bobbins.

broken, as the unsupported depolarizing material is easily disrupted by the outward pressure exerted by the electrode forced into the central opening of the bobbi. In the improved method, on the contrary, the Wrapping engaging its peripheral surface sustains or reinforces the material, permitthe insertionv of a carbon electrode of su cient size to insure adequate electrical connection between depolarizer and electrode, without danger of damaging or destroying the bobbin. In addition, the process of manufacture is greatly expedited by continuously wrapping the extruded material, instead of separately wrapping each.

bobbin.

In the accompanying drawings, illustrating a preferred embodiment of the invention Fig. 1 is a longitudinal section through an extrusion and wra ping machine,

Fig. 2 is alongituinal section through a modified extrusion die,

Fig. 3 is a transverse section 0.11 line 3 -3 Of Fig. 2,

In following the prior. procedure, a large percentage of bobbins is Fig. 4 is a perspective view of a wrapped body of mix, and

Figs. 5 and 6 show mix bobbins provided with a plurality of vertical perforations, the former ligure in elevation and the latter in transverse section.

Referring to Fig. 1 of the drawings, plas-y tic depolarizing material 1 is forced forwardly through the funnel shaped member 2, preferably by substantially constant pressure derived from any suitable source. The funnel 2 terminates in a tubular extension 3 which operates as a .die in forming an extruded 'bodyl of the chosen diameter. When it is desired to provide the body With a cylindrical perforation, a core for the dieconsisting of a rod 4 of suitable cross-section is mounted in a spider 5 rigidly attached to the funnel Wall. The rod 4-extends outwardlywell be ond the tubular extension 3 and is preferab y co-axial with the extension. The extended portion of the -rod serves to support the extruded plastic during the Wrapping operation.

The means for applying a protective wrapping to the extruded body,comprises a reel carrier 6,journal1ed on extension 3 and held thereon by an suitable means. The carrier is adaptedfto e rotated about the longitudinal axisof the extruded body by means of a pulley 7, driven by belt 8. An inclined reel 9 is mounted upon an arm 10, integral with carrier 6. The arm 1() carries a bracket 11 to which is secured a guide rod 12 extending in close parallel relation to the extruded body. 13 carried by the reel passes between the guide rod and the extruded body.

Rotation of the carrier 6 causes the fabric carried by the reel to be continuously drawn off and wrappedv in an-overlapping helix about the extruded mix. Guide rod 12 presses the fabric toward the mix .to insure tight wrapping. If desired7 the guide rod may be made adjustable so as to permit regulation of the' tension at Which the fabric is supplied. It may be stated thatv the term fabric, as used herein respecting the relatively wide continuous sheet or band 13, is to be considered eneric to all of the bibulous materials w ich are csuitable for Wrapping mix bobbins.

The referred means for securing t-he .fabric a out the mix comprises a container The fabric or other material 14 arranged to discharge a regulated stream of paste or other adhesive material. A Wiper 15, rotated by a pulley 16, engages the wrapping and uniformlydistributes upon it the material supplied from container 14. The pulley 16 .is preferably integral with an extensionil' keyed to a cylinder 18. Surrounding the major portion of the cylinder 18 is a heating'chamber 19, in which the adhesive is hardened. Gras flames 2() or any other suitable source of heat may be supplied in the heating chamber. In the arrangement shown, belt 21 rotates the cylinder 18,'so as to present all parts of its surface to thesource of heat.

Instead of pasting the fabric, it may be secured by tying or the like. In some cases, also, the fabric may be omitted, and paste or other suit-'able material adapted to hardenI upon th'e bobbin surface may be applied directly thereto.

vAny desired means for severing the elongated tubular body may be adopted. An eccentrically mounted cutting disc v 22 has been illustrated by Way ofexample. The severed portions may be delivered to packing devices or otherwise disposed of. If the product is Wrapped depolarizing mix, carbon rods may be inserted y hand or the tubular sections may be fed into any suitable type of machine for automatic insertion of the rods. A wrapped bobbin so prepared is illustrated in Fig. 4. It Will be noted that the ends of the bobbin are not covered. For many purposes the bobbin may be left in this condition, but discs of paper or the 'like may of course be placed over the ends, if desired. An advantage of the improved bobbin is the elimin. tion of the objectionable bunching of fabric about the proJect-ing end of the carbon vrod, common to prior wrapped bobbins.

In the modified form of the invention illustrated in li`igs'.. 2 and 3, a plurality of slender rods 23 are seated in the spider 5 and pass through extension 3 in parallel relation to the core rod 4. This arrangement is especially designed for the production of y lnix bobbinsfor use in. deferredaction cells of the water activated type. The numerous perforations formed in the mix, by forcing it aboutrods 23, permit rapid absorption and even distribution vof the activating liquid.

A bobbin of this type, with cylindrical ver- 'extend entirely throughthe bobbin.

tical openings 24, is shown in Fig. 5. Perfo' rations24, of a different shape, are illus-` trated in Fig. 6. Obviously the size, shapey and' location of the perforations may be eatly varied. They may be very convenlently'made during the extrusion operation, as described, but may also be formed in other ways. vFor example -ordinary tamped bobbins, or the extruded bobbins described herein, may bepunched or bored to give the de-v sired number of openings, and these need no vThe cylindrical conformation'of the bob-A bin and its axial perforation is shown by way of example only, as the shape of the cxtrudcd body may be varied according to its intended use. It is preferred to extrude the plastic material continuously, but an intel'- mittcnt feed may be used, the wrapping and severing devices being synchronized with the movement of the extruded body. Various other departures from the specilic form illustratcd herein fall Within the scope of the appended claims.

I claim:

1. A depolarizer for dry cells having a covering engaging its `peripheral surface, said covering comprising a single continuous helically extending sheet of bibulous material.

2. A depolarizer .according to claim 1, wherein portions of said sheet overlap one another.

3. A substantially `cylindrical bobbin of depolarizing materlal having a protective and reinforcing covering engaging and united to onl the cylindrical surface of said bobbin, leavmg the ends ofthe latter uncovered.

4. A. depolarizer for dry cells having a protective and reinforcing ycovering on its peripheral surface, said covering comprising a helically extending sheet of bibulous material and a coating of hardened adhesive composition.

5. As a new article of manufacture, an extruded depolarizer body for dry cells, and a covering on the peripheral surface of said body, said covering comprising a helically extending sheet of bibulous material engaging said liody.`

6. As a new article of manufacture, an extruded depolarizer body and a covering on the peripheral surface of said body, said covering vcomprising a hardened adhesive composition.

7 As a new article of manufacture, an extruded body of depolarizing material havingy a hole extending therethrough, and a. protective and reinforcing covering on the pcripheral surface of said body, said covering comprising a hardened adhesive composition.

8. As a new article of' manufacture, an cx 9. An elongated body of depolarizing material having a reinforcing and protecting covering engaging the peripheral surface of .said body, said body being of such length that it may be divided intona plurality of def polarizing units, each peripherally reinforced and protected by a covering.

In testimony whereof, I affix my signature. ARTHUR J. BRIGGS. 

